Method of plasma spraying magnetic-cermet dielectric coatings

Details Method of plasma spraying magnetic-cermet dielectric coatings Method of plasma spraying magnetic-cermet dielectric coatings

1992-07-23

1993-05-18

Pianalto, Bernard

Coating processes

Spray coating utilizing flame or plasma heat

Nonuniform or patterned coating

427123, 4271262, 427129, 427131, 427261, 427307, 427402, 427446, 427452, 427455, 427456, 427569, 427574, 427576, 427578, B05D 512

Patent

active

052119912

ABSTRACT:
A method of forming high temperature resistant coatings having magnetic particles in a ceramic matrix by plasma spraying. Typically, the surface to be coated is cleaned by a combination of solvent cleaning and abrasion, such as by grit blasting. A mixture of ceramic particles and metal particles is provided and the mixture is plasma sprayed onto the surface using a sufficiently large proportion of metal particles to form a conductive first coating layer. A second layer is plasma sprayed with a mixture having a gradually decreasing metal particle content. A third layer is plasma sprayed using a mixture having a sufficiently low proportion of metal particles as to be dielectric. A pattern of small, spaced, conductive areas is then formed on the surface of the third layer. The resulting coating is durable, high temperature resistant and absorbs incident microwave energy.

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